Page 19 - Basic Course

KNX BASIC COURSE

2.2 Group address

Figure 4: Structure of group addresses

The normal communication between devices in an installation is carried out via group
addresses. The project engineer defines for each function in the installation an
appropriate group address. He can freely select the group address structure.

2
65535 group addresses are available . Only the group address 0/0/0 is reserved for so-
called broadcast communication (telegrams to all available bus devices). An example of a
broadcast message is the allocation of an individual address.

2 Only valid from ETS4 onwards. Until ETS3 the most significant bit was set to 0. Main groups were
therefore limited from 0….15. 32767 group addresses were available in total.

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